Answer:
1.) x = 5
2.) x = -5
Step-by-step explanation:
(22x2 - 15) - 85 = 0
4x2 - 100 = 4 • (x2 - 25)
(x + 5) • (x - 5)
4 • (x + 5) • (x - 5) = 0
x+5 = 0
x = -5
x-5 = 0
